Page 88 - BOLA Catalogue

SCREW JOINTS / COMPONENTS WITH GL THREAD
BOLA Laboratory Screw Joints
In practice, there are many applications where it is necessary to connect hard-walled tubing (e.g. made of PTFE, PFA, FEP) or tubes (e.g. made of glass, metal, plastic) with devices with GL thread (glass thread).
BOLA Laboratory Screw Joints are ideal for making these connections.
Components
Each laboratory screw joint consists of a screw cap with a female GL thread and bore as well as three inner parts: v-ring, tapered ring and sealing ring
Assembly and function
Assembly can easily be made by hand:
First, the screw cap and the inner parts are pushed on the tubing in the right order. After that, the tubing has to be put into the counterpiece and the screw cap has to be tightened. The screw cap presses the sealing ring and tapered ring tightly on the counterpiece. At the same time, the v-ring is compressed and the tubing is fixed tightly. The connection is absolutely tight and even suitable for vacuum. The laboratory screw joints for GL 14, GL 18 and GL 25 resist pressures of max. 10 bar at room temperature.
BOLA Laboratory Screw Joints
Choice
It is easy to choose the suitable laboratory screw joint:
First of all, the outer diameter of the tubing or tube and the size of the GL thread to which the laboratory screw joint shall be connected have to be determined. The size of the GL thread corresponds to the outer diameter of the thread, i.e. a GL 25 thread has an outer diameter of 25 mm. Further assistance for the determination of threads can be found in our Technical Information (page 366).
Also the application is decisive: Will there be temperatures of more than +150°C? If so, the BOLA HT Laboratory Screw Joints made of PPS black (page 77), which also provide a good chemical resistance, are the right choice. Or is it more important to have a very high chemical resistance? Then you have to choose BOLA Laboratory Screw Joints (page 90) made of ETFE (red). These can be used up to temperatures of +150°C.
For big flexibility, all screw caps and inner parts are available separately.
You will find suitable tubing on page 189.
Material: Temperature resistance: Chemical resistance: Pressure: Vacuum:
PTFE, ETFE from -50 °C to +150 °C +++ universal 10 bar suitable
Product description:
Red screw cap made of glass-fibre reinforced ETFE, inner parts consisting of a v-ring (ETFE), a tapered ring and a sealing ring (both PTFE) as well as an o-ring (FKM) for tubing diameters under 3 mm (not exposed to the medium). Very good chemical resistance, suitable for tempe- ratures from -50°C to + 150°C.
For tubing O.D.
mm
Cat. No.:
Thread GL 14
Cat. No.:
Thread GL 18
Cat. No.:
Thread GL 25
0,8
D 593-02
1,0
D 593-04
1,6
D 593-06
D 593-26
2,0
D 593-10
D 593-30
2,4
D 593-12
3,0
D 590-02
D 590-10
D 590-22
3,2
D 590-08
D 590-20
D 590-24
4,0
D 590-04
D 590-12
D 590-26
6,0
D 590-06
D 590-14
D 590-28
6,35
D 590-62
8,0
D 590-16
D 590-30
10,0
D 590-18
D 590-32
12,0
D 590-34
14,0
D 590-36
Applications:
Connecting equipment and fittings with GL threads with hard-walled tubing or tubes made of glass, plastic or metal. Fixing probes, thermometers, dip tubes or cables in reaction vessels. Ideal for use in aggressive ambiance (e.g. with aggressive vapours or evaporation)
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